quakeforge/libs/video/renderer/glsl/quake2d.frag

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//precision mediump float;
uniform sampler2D texture;
uniform sampler2D palette;
varying vec4 color;
varying vec2 st;
void
main (void)
{
float pix;
pix = texture2D (texture, st).r;
if (pix == 1.0)
discard;
gl_FragColor = texture2D (palette, vec2 (pix, 0.0)) * color;
}